Does thai airways and star alliance have any "paid" ways to access J (without buying tickets direct). 6k would net me close to 400k points with QF and generally gets me 2.5 return business flights to BKK A year.
Worth checking out both Aeroplan (Air Canada) and LifeMiles (Avianca). Plenty of info on these here in relevant forums. A BKK-SYD return using lifemiles could cost as little as about $1800-1900 AUD return.